Electronic Modular Control Panel II+ (EMCP II+) for EUI Engines Caterpillar

Troubleshooting Diagnostic Codes

Usage:

Diagnostic codes are associated with failed electrical components or circuits, that provide information to the GSC+. Diagnostic codes are also associated with failed electrical components or circuits, that receive information from the GSC+. The diagnostic fault code closely identifies the cause of the fault.

Each diagnostic fault code consists of the following items: a component identifier (CID), a failure mode identifier (FMI) and a fault indicator ("DIAG"). These items are shown on the upper display. A fault indicator can be active or inactive. The CID identifies the faulty component in the system. The FMI describes the nature of the fault. When the "DIAG" indicator is FLASHING, the fault is active. This means that the fault is present. When the "DIAG" indicator is ON CONTINUOUSLY, the fault is inactive and the CID FMI is recorded in the fault log. See Systems Operation, "Fault Log Viewing OP1" in order to view the fault log. When the "DIAG" indicator is not showing, there are NO diagnostic codes that are detected or recorded. Service personnel interpret the identifiers in order to assist with troubleshooting.

When a diagnostic fault occurs, the GSC+ FLASHES the "DIAG" indicator. The GSC+ determines the type of a fault. There are two types of a fault: an alarm fault and a shutdown fault. Then, the GSC+ FLASHES the corresponding fault alarm indicator or fault shutdown indicator. The CID FMI is immediately shown on the upper display when there is a shutdown fault. When there is an alarm fault, the alarm codes key is pressed first. Then, the CID FMI is shown on the upper display.

The GSC+ has a fault log to help with troubleshooting of diagnostic faults. Inactive diagnostic codes (CID FMI) are recorded in the fault log for viewing at a later time. Also, the number of occurrences are totalled. The number of occurrences is shown on the upper display. The CID FMI is also shown on the upper display. An active alarm fault becomes inactive when the fault is no longer occurring. Also, the engine control switch (ECS) should be turned to the OFF/RESET position for shutdown faults. The "DIAG" indicator is FLASHING when the alarm fault is active. The "DIAG" indicator is ON CONTINUOUSLY when the alarm fault is inactive. See Testing And Adjusting, "Fault Log Viewing OP1".

During troubleshooting, it is sometimes necessary to disconnect the harness connector from the GSC+ and faults are created. Because of internal circuitry, the GSC+ recognizes this condition as a FMI 03 fault for certain components. An FMI 03 describes the voltage that is above normal. This fact is also used as an aid in the troubleshooting process. Clear these created faults after the particular fault is corrected and the fault is cleared. The following diagnostic codes are recorded in a properly operating system when the harness connector is removed from the GSC+.

CID 100 FMI 2 - Pressure Sensor (Engine Oil)

CID 110 FMI 2 - Temperature Sensor (Engine Coolant)

CID 111 FMI 3 - Fluid Level Sensor (Engine Coolant)

CID 175 FMI 3 - Temperature Sensor (Engine Oil)

CID 190 FMI 3 - Speed Sensor (Engine)

CID 336 FMI 2 - Switch (Engine Control)

CID 590 FMI 9 - Engine (ECM)

An FMI 2 describes an incorrect signal.

Note: A CID 111 FMI 3 and a CID 175 FMI 3 will only be recorded if the machine is equipped with the proper sensors.

Clear diagnostic faults after the fault is investigated or the fault is corrected. This will avoid a confusion during a future service call. The "DIAG" indicator is OFF when all diagnostic faults are cleared from the fault log and no active diagnostic faults exist. See Testing And Adjusting, "Fault Log Clearing OP4".

Diagnostic Codes

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Table 1
Diagnostic Codes ⁽¹⁾
CID/FMI	Description
CID 100 - Pressure Sensor (Engine Oil):
FMI 2	Incorrect signal
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 110 - Temperature Sensor (Engine Coolant):
FMI 2	Incorrect signal
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 111 - Fluid Level Sensor (Engine Coolant):
FMI 3	Voltage above normal
CID 168 - Electrical System Voltage:
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 175 - Temperature Sensor (Engine Oil):
FMI 2	Incorrect signal
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 190 - Speed Sensor (Engine):
FMI 2	Incorrect signal
FMI 3	Voltage above normal
CID 248 - CAT Data Link:
FMI 9	Abnormal update
CID 268 - EMCP II+ Electronic Control (Generator Set):
FMI 2	Incorrect signal
CID 269 - Sensor Power Supply:
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 333 - Alarm Module Control:
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 334 - Spare Output:
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 336 - Switch (Engine Control):
FMI 2	Unknown state
CID 441 - Electronic Governor Relay:
FMI 12	Faulty component
CID 442 - Generator Fault Relay:
FMI 12	Faulty component
CID 443 - Crank Termination Relay:
FMI 12	Faulty component
CID 444 - Starting Motor Relay:
FMI 12	Faulty component
CID 445 - Run Relay:
FMI 12	Faulty component
CID 446 - Air Shutoff Relay:
FMI 12	Faulty component
CID 447 - Fuel Control Relay:
FMI 12	Faulty component
CID 448 - Programmable Spare Relay:
FMI 12	Faulty component
CID 475 - Relay Driver Module:
FMI 3	Voltage above normal
FMI 4	Voltage below normal
CID 500 - EMCP Electronic Control (Generator Set):
FMI 12	Faulty component
CID 566 - Unexpected Shutdown:
FMI 3	Voltage above normal
FMI 7	Improper mechanical response
CID 590 - Engine Electronic Control Module:
FMI 9	Abnormal update
CID 770 - Customer Communication Module Data Link:
FMI 9	Abnormal update
CID 859 - Kilowatt Level Output:
FMI 3	Voltage above normal
FMI 4	Voltage below normal